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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72de1258b472229cf527f7727341b48fbfe70df85dd1610b3cd199a241da4943' 
  AND token = '7xrpoPujpJ7dHETlmNa00WVS51cpuIOHbh0wkSehVi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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