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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fece266d9a1bc5cd6fa734fb200c56265dc2447e56d51550a43d39cc8ad7221e' 
  AND token = 'R9kiTdoy71+8vx0IZsuc4MQUEFXGYfZT4kQqEkFd41M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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