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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73663e8e10182a8b08a7ec5c12e4e4ad24aabc847105a5915b465d574818189e' 
  AND token = 'tL7oT2O4fRmuWMjSVGDNvo7Wbr1PzvycGrCa9H04QX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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