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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1eb1d43177efa9263ff0be8694b8dd076dec52282f0511c25dc4f0c297d638' 
  AND token = 'oz6+gv3D7htOILPGBJIrSi3arIaOLYDEibIy9MH+WWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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