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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a47c8d9ec21248c531f53291038f5299928cb5be46f57d0a7ccb12f9fdc6bc' 
  AND token = 'RDWTNF2910OOkr9z5FY1Z3lwjjCJSRpFRB8qd6nq41M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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