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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c327ed5d0fd37a5c16eff226cbc87737a2cf74a805fcd3ea2219ad1c0f8eb543' 
  AND token = '5BckqU9UewddnZzmp3hcl8jZDfxB9/biHrawjlIHk+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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