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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfaaccf9e9d705e7966b072e9139ebf4059ba8a95455f796f12c5203c4297f55' 
  AND token = 'dmTrhp1fip2GGvYKocWhJuk8SxRXN9CeLalY5y0xEFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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