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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcffff8b19457c815ae0a789579dba1e5da708dbcc2869e1ce0e8a8dd91f9de2' 
  AND token = 'An+Dk4z+w6PszMVQZjbm5PlpbMzl0STm4GOigrdHoRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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