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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da8c12d7a462c0fb0f88a7432223ad24310e835345f2179c4fd06f3c9c6bbd3' 
  AND token = '4+STpjIisAdlRNooG2oTfHXUfqiRpDFvPOEIewyHFrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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