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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb037f8a121baccb8c9961913c51c6f40a498ce061c4f8078d9a5bc2973ef318' 
  AND token = 'MXioNU+I6yyRI6oj0uVrIlXXFBbNqLQ6BnfyUBKjRTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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