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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e0769b137734d1fe5093147b72ef0a4965e6364e15db814da374ee113fa9fc' 
  AND token = '2fIuWkhDX0n3+GglpGLJ5N21N8rorsPOwkIQkU0m7BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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