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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744ad61fdcbf076576c41916245eab607ae55317359fa232cc79177ef8164d30' 
  AND token = 'qU4ym9r1gEIvKb6tcMLw8Xi9dLSD7IdX+wMjbs1mhyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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