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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df714cc66bce5fe1e346ccd6b97788a16402f7ca3d392bd918d969276a720cac' 
  AND token = 'AgINAL1rx+78Y5H4ufCew+8CB8W9THFD4hxMjRLbhTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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