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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992996c775671634cd5c77880947b27802f7c01931d76811014e59986bd6213a' 
  AND token = 'K8uKOdokOy3jzTkc5lzz6BeOnm6erB1+BuLC8LcZ8+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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