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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e74944c2015e359235dd07831e5c4e808a9c4b89a00740041db743f8f1d668' 
  AND token = 'a5K6jQPPWGcpzVtBSYzBDVIxv9myI7dFU6cgLzu16F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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