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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2d042920b1a1d4c078f1c3f74fa3c25c0965d8a836f234f30d6bf989781ed0' 
  AND token = 'TU9Z3ZRy0b2zZRc0CDHzmbl2U/u3FTi/amm74aXx3DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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