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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da315362d7142bda4e9aef503f41690c2de6df60cdd87381a74939946562fbc3' 
  AND token = 'Cb71eILVKitEYCW9PHBN9kJvGJNrX/14zLVaTo6h+D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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