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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e715f6fd2571987dedce0cad0a954e136c37fe03265e6b7c7d700864d26519' 
  AND token = 'j2gAWkU/LCAcJGtD3msnaZSY1CapQGu/JDmQ+A2851k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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