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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167f0c5fd28778b25d8204698553a24588a032b0b0b6715fbc389811d19c34af' 
  AND token = 'XKYxhcedpywXC26LKcgf9ujI+ADwXqA4En2mWgdSCEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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