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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0ccd22e4ba104bdca1ce1e05dcd5cfe9196098757f29ba8eb769c4cbcc0739' 
  AND token = '4QJbBHXE1eERt96QVUKk6G3ffgxNt+QYOJpfHJA6pB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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