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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14978678daba12f96e54c447cbb712979c4da65a68886eaf71b95e3671dfcd40' 
  AND token = 'Y6w0xQR7Bw9xhSyK7k8N8/PgR8+aw93JYstc5acjjVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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