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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef87fc109276c08e24714bbdd1d69f0da38ece05f096ce25295261ec518c5d0' 
  AND token = 'H8Vmdn1/rvKimQNFZ8mDGp4MIQSRr0ZZlYSBuqRP8SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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