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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35e5069c5ab87bc9311cab2ce8776fa65823d96bed40be1a9550e44e3b33c0b' 
  AND token = '06vm71Bf1hQlGN3KnH8ROn1TI0p3jlEFvXHlCTTnYLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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