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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db687fe1e68dc5ee032fa4fbb42a14f344314f1efd2f9ec6f3f590aa07e57e74' 
  AND token = 'GObRCy7rQvgVa1utz0fIgt/JJxHaEFgER00+4HNPtNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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