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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40dce1bdb48cd55ec80b52257286de9a93f5d88a1dde67ed6e25938acbb5cb8' 
  AND token = 'z8of17/ccUYfyStDNbthVr+3ccF92rpC1lElerrGSaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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