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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2a1e5f8e574132383b389a4d491b5d17b2040a72344e5a050116de6321a7ac' 
  AND token = '30v4zepUBE3qWW6KankvD1TTHT8gbHY5WzW3AoY+S14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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