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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab30ead37ad911b310018f7f9fbc58412835401ea5d9c491f2cb94b155f329f' 
  AND token = 'eEw3aoKMUyYyuz/PQDjf6+KaOmow3JxO26Q0Selg0vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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