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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f084d95e683f8edfda969edd2aa2f2dce8ea2e234da4d8e2eb758960de4014' 
  AND token = 'zmpBTqR2bTHzHOGoLGyZ1cCSIkHlKiaV2tvBU3kzt20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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