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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c0b17f05d4056827752673a0cf636bd755bfc3a696a6721a7b6d8727456db3' 
  AND token = 'z2/mBhfU4/afM29OpgHR5STDkVPo/XSxwo+HFPbdnms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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