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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237b5111e90b7f671d8cf66ad1138b6a209490753c7349374eeae6e6f600ec9a' 
  AND token = 'clHIqN+pcM/UFSWkPm3F7HRkdOQ2kaaho4Pzb5CetQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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