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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99502538ad0b6b5c6ee9cca8f8b90d21b4293e030717be1db2a22fb7c017312' 
  AND token = 'MlKBtcaZLR1iJhWQD+If5+MI802SqnlNvc+a2zNxopE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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