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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2396260f149195251ca1f7ddd9f9676435d3f7c778a953c4d289fd30a30065' 
  AND token = 'uq1kjavsEDlYY0IC6na72BAY7dCsTd8T5e8r5qM6y0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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