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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92e29fba42078e580b51ee6e7cb4382adfb5a5f8e854f76e291cac4b90e9371' 
  AND token = 'r6iqyrO8OeU4uKDbD+keE9jwHIL28m9tOvx/IAkxoKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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