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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01d58f64eb48c8b18c328195e95de68e0644b28e4ad97c52a821df7c95e10781' 
  AND token = 'anOvYS+1t7avmtdBzy++fosyzg59ncEdUsU1pEB4v1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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