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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3b6f1c6d94460ae308a875e303d81ce01de656a43448fd928ad6877297f4f5' 
  AND token = 'JL5UVukyWEcvbgPI9rindGbmmg48twU61Hkv8pQ8AXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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