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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a509686deb6da952c66dc84dc3a992a1a77453afe05be31209a57991acd47c39' 
  AND token = 'YR7UQOf26s7GfrxnzSpT+9ZuEAo1+V6RahknuUTlSWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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