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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0b044d13f9cf4e77ea02d0195a94a315396939a1a8557c6b60672cd3cb01f1' 
  AND token = '37up9mTqPpf2XgbnHQB+/Lm6RCoB83cQkOGerGfm5/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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