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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94921a93112c53ca2f25b2682d6703b09c77b34267ef5f8f89a24831f9530593' 
  AND token = '5NxVRi4FiYwZK6EmGTHvQ32Eq/ZiAkXr3kUry802nlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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