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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713c24ee4077b20383eb06c48e2bd1cac4a98f9cd871b3f4c67bd45ab2a9d529' 
  AND token = 'PBjYzBYWbzfCvZqcNa61sF/rO1kZymZUmFnmWc03H74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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