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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcedabe93c83329a752ab920755292d9ed11ce9fe50f4623a2abd2f9695abb0' 
  AND token = 'cpi5DW6lBn6XmwJusWZoq5n54PC3PJILMNXAFIlEVZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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