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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf03c700386a1ab94cca5099a2c3594c4afb3a445bc4a6af8d58347364a2a35' 
  AND token = 'tTREwnZSU5ANn13LUCEMZWwVNm1/+5VCLp9MAwKX5WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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