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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143435d00cac87b5f45b6ede9016c8144e928ac36cdd34389ae9c12d2aca76bb' 
  AND token = 'Oom3HFshxrtZrSXpB440CZ8ugJa86ERwC31X+OlJFf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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