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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942016a1befaa34aa1769876c4c9371a024355f8389b84ecfaf7b866f7c10103' 
  AND token = 'LNIrs+/neCNKriUCHZ3Urrp8PZxYZGjfxtrSodkSnjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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