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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3c8dc784b589dcd1d9870eaf0dad255d2f18e6387c020e2df621ed8b76102a' 
  AND token = '4scjcGi7ITJZ3WLt1yEczC6wM06KrW11+ycFRL4Hwj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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