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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76551b203c6b8a9bbba221bde1143b0e0f68b7e77f22e6e7c6e81cdcff125fe9' 
  AND token = '6OesZNn9bQM/pIz1WGJFhloM9eftN48Oe4Reeatp6gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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