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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beaa0bd2d21ce0b8d17312948af7be25facbf3e9033bb6252923998a4427fe69' 
  AND token = '7NcHVB56HFGDAPFTyk90cNDXQnqCUbyGZIlOslKYn/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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