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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47c382ba3ce165b131b419f41819f55c3fe15cb0c0e9a134f71b748332ae6a5' 
  AND token = 'NEUqFhUSi21JtwaOMEgu3F0Nml3d5sw2U9fIFRjBYhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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