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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bdc2b863a5ae32f69ae3dd6ab32e9c387fe1292e660b55f9ac66015d116063' 
  AND token = '7IwwxQV2fmJ0FT4D6rD/bgmppCY9oVUjgkVjXpHjPoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}