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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e60a739f0b1076b79927c6c450c931727d0ed85434f26c2b3614261386a8ccd' 
  AND token = 'lMOw1wDyXPKyq6FcK265tDS/A2c+ZTPjTb5QFjMExiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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