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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09ec51e2f076d4130ba26ffbc67995421e81d81a0c51b6f39717e362036ea5d' 
  AND token = 'ocMvw9SPSOD0P+Q7/ALo0tL2xC5GWoCzYtVa58ycGDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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