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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3562f768134c9b96881c73e03c0c3bb4546b64a2f622eb741a60332370b2b84c' 
  AND token = 'N2M2IYbHLKL4U411eDnbgn4AYCs0K9b2CRWcOrxK5kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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