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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb02b60de2183cdce5d1b73748aaacf6907363dbb304b710def461bcd6a4c8ea' 
  AND token = 'P7fXkLak8UZbBJIqL+PkmJioDUC5DvSBfIEiIrkTyyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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