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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17670b6999d82aa244d13922f48d0615a7ddf8e36d7ff47b45b72abf09f7adc4' 
  AND token = '7ZxzmxXmLkzV8lD4oBlfq/V/AU54SldiXVsYg0Wiki4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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