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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0438ee266414a6ec2c39ca2ccf7b356a99d0873ec80f4a53e409afd7375e6a' 
  AND token = 'bRlgVhYqbQmjuLIAn/6CR5yqOahg5G7ILCq89MZnEW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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