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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a390a699a774d93d692da09278b3ddb3e6cb374fe24abf67106a3c8f0f75d3' 
  AND token = 'z2LqE3ziw4iTRVxVBEWYg/njhRUP1Inou322yW3tBeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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