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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b233e81586991cc7142fe9667ac18e868aa3c5f682379e239f41905db75ae07e' 
  AND token = '9ah8F+LnJ6hC1cfHkYBOer/9JRRf7Cc5r3h30OMyzEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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