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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950c13fbb3f5938bdc34ba797f1e82d2e031f16831d140088877f9eb918392b5' 
  AND token = '49Rk72+/yO+TS4bY1er+GpKPfdvj0FzRvSvbyo9H2uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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