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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81305f3042325bba4eb3ae1afdc49019e68e9a9403dc3d0124fbefed6e994ea0' 
  AND token = 'xIWbsYs3/8/6xBCMfEK1emM5ZSIp0BspRbqcfjmGEXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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